202220111120821 has 2 divisors, whose sum is σ = 202220111120822. Its totient is φ = 202220111120820.

The previous prime is 202220111120813. The next prime is 202220111120837. The reversal of 202220111120821 is 128021111022202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131688500264721 + 70531610856100 = 11475561^2 + 8398310^2 .

It is a cyclic number.

It is not a de Polignac number, because 202220111120821 - 2³ = 202220111120813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202220111120891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101110055560410 + 101110055560411.

It is an arithmetic number, because the mean of its divisors is an integer number (101110055560411).

Almost surely, 2^{202220111120821} is an apocalyptic number.

It is an amenable number.

202220111120821 is a deficient number, since it is larger than the sum of its proper divisors (1).

202220111120821 is an equidigital number, since it uses as much as digits as its factorization.

202220111120821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 25.

The spelling of 202220111120821 in words is "two hundred two trillion, two hundred twenty billion, one hundred eleven million, one hundred twenty thousand, eight hundred twenty-one".